Login issue after upgrading Netflow Analyser

Login issue after upgrading Netflow Analyser

Hello,

I would like to seek your assistance after I have upgraded Netflow Analyser.
The old server was running Centos 6.3 and Netflow analyser 9600. Now, it's running Centos 6.6 and Netflow version 9860. 

After upgrading, I could login by account admin without any issue. If I use an Operator account, I could open the page but after filling username/password, it raises error "Access to the requested resource has been denied" as below.

Could you please instruct me how to deal with this issue?
Thank you in advance.

HTTP Status 403 - Access to the requested resource has been denied

type Status report

message Access to the requested resource has been denied

description Access to the specified resource (Access to the requested resource has been denied) has been forbidden.

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